Heat exchanger



May 25 1926.

L. N. UDELL HEAT EXCHANGER 2 Sheets-Sheet Filed March 26, 1924 .rlIIIIIIIIIIIIIIII Patented May 25, 1926.

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LOUIfi N. 'UDELL, OF BOSTON, MASSACHUSETTS.

HEAT EXCHANGER.

Application filed March 26, 1924. Serial No. 701,884.

heat is to be exchanged by means of two pipes, one within the other.This construction is somewhat diflicult and expensive to' make andassemble, and one object of the present invention is to provide asimple, economical and easily assembled, structure which shall functionto equal or. greater advantage as compared with'the two-pipe system.Another object is to provide an im- 1proved construction of cooler fortaking the eat out of liquids and gases in refrigerating apparatus thatwill more rapidly and effectively dissipate the abstracted heat than thetwo-pipe system referred to. A further object is to provide aconstruction of heat exchan er which will permit of the easy assembling,and separation of the two conduits carrying the respective liquids.Other objects and attendant advantages of the invention will beapparentto persons skilled iin the art as the same becomes betterunderstood by reference to the following detailed description, taken inconnection with the accompanying drawings in which I have illustrated asimple and practical embodiment of the principle of my invention, andwherein-' v Fig. 1 is a side elevation of my improved heat exchangerwith a portion broken away and in section; v

Fig. 2 is an end elevation viewed from the right of Fig. 1, with thetank and one trough in vertical section;

Fig. 3 is a perspective elevation of a frag-- ment of one of the troughsand its supporting bracket.

Referring to the drawings, 1O designates as an entirety each of a group(herein shown as three) of zigzag vertical coils located side by side inclose juxtaposition. Underly ng alternate limbs of these coils are opentroughs 11 and 12. Said troughs are formed with closed ends 11' and 12'respectively,

comprises a collar 14 encircling t and with opposite open ends 11 and12", re-

spectively; thev closed end of each trough being somewhat higher thanits open end,

as clearly shown in Fig. 1, so as to prevent any possibility of lateraloverflow of the liquid discharging from the low end of each trough intothe high end of the next underlying trough. To permit the troughs to bemade of uniform width, the side walls at the closed end of each trough,which receive between them the discharge end of the next underlyingtrough, are outwardly-offset as shown in Fig. 2.

To support the troughs I may employ a series of posts 13 on each ofwhich is mounted a group of supporting brackets properly spaced to seatthe several trou hs. As clearly shown in Fig. 3, this bracket preferablye post 13 and fastened thereto by a set screw 15 or other equivalentmeans, a bracket plate 16 integral with or attached to the collar 14,and an arm 17 fastened to the bracket plate 16 as by bolts 18 and ofsufficient length to span the bottom of the trough and having anupturned end 19 embracing the outer side of the trough. It will beobserved that the adjacent limbs of the coils are slightly inclined inopposite directions and that these limbs lie upon and are supported bythe bottoms of the troughs. ThlS insures a gravit flow of the coolingliquid from each troug 1 to the next underlying trough in a zigzagcourse; but the inclination of the troughs is suflicientl slight to makethe flow slow enough to a ways insure the submerging of the limbs of thecoils, exce t their curved end connections, in the cooling liquid.

The top limbs of the several coils are connected by curved pipes 20,preferably of reduced size as shown, into an upper trans verse header ormanifold 21; and the lower limbs of the coils are connected b straightpipes 22, preferably of reduced size, into a similar header or-manifold23.

For convenience in disposing of the cooling liquid discharged from thelowermost trou h, the unit is mounted ina tank T provide with anoverflow outlet 24 slightly below the bottom of the lowermost trough.

lower headers respectivel is not essential but is preferably employe forpractical reasons in construction, since making'it easier to effecttight'connections by welding.

It will readily be seen that the troughs or pans 11 and 12 can bewithdrawn whenever required for cleaning or repair and then reinsertedby a simple endwise movement, without disturbing the coils, and eachtrough or pan can so be withdrawn entirely.

independently of the others.

The described apparatus is preferably operated in the counter-current orcounter flow manner, the liquid or gas to be cooled being introducedthrough the lower manifold 23 under pressure, and being dischargedthrough the upper manifold 21, but manifestly, so far as the structureand its advantages are concerned, the direction of flow is immaterial.The cooling liquid, of course, flows slowly by gravity from top tobottom, flowing from the discharge end of each upper trough or pan intothereceiving end of the next underlying trough or pan, and maintaining acontinuous submer ence of the limbs of the coils. Another :1 vantage ofthe use of the troughs or pans is that a single trough may be made ofsufficient' width to embrace the corresponding horizontal limbs of anynumber of coils placed side by side, thus effecting a considerableeconomy in construction. Where the system employs a considerable numberof coils dis osed side by side, the trough supports will preferably takethe form of underlying cross-bals supported at their ends by posts onboth sides of the coils. It is believed that the foregoing descriptionwill make clear to persons skilled in the art the novel economies ofconstruction and maintenance, and other recited advantages of theinvention. tails shown and described for purposes of illustration arenot of the essence ofthe invention, but may be variously modified withinthe skill and judgment of the engineer without involving any departurefrom the invention or sacrificing any of the advanstructural features,practical Manifestly the specific structural de-' tages thereof. Hence II reserve all such variations and modifications as fall within thespirit and purview of the appended 1 claims.

.I claim- I 1. In' a heat exchanger, the combination of a zigzag ,coilhaving its limbs connected by integral bends and disposed in a verticalplane, and two oppositely facing series of endwise removable troughsunderlying alter- .nate limbs of the coil respectively and to- 2. In aheat exchanger, the combination of a zigzag coil disposed in a verticalplane, and two oppositely facing series of inclined troughs underlyingalternate limbs of the coil respectively. and together wholly enclosingthe bottoms,'sides and'ends of said limbs; each of said troughs having alow open discharge end and a closed high receiving end formed withoutwardly offset upward extensions of its side walls between whichextensions tlie'open discharge end of the next upper lying trough isentered.

3. In a heat exchanger, the combination of a group of vertical zigzagcoils disposed side by side and contiguous with corresponding limbsthereof lying in common transverse planes, two oppositely facing groupsof lengthwise removable oppositely inclined troughs underlying alternategroups of limbs of said coils respectively, with the discharge end ofeach upper trough delivering to the receiving end'of'the next underlyingtrough, posts mounted'alongside said coils, adj ustablebrackets on saidposts underlyin and supporting said troughs, horizonta l manifoldsdisposed crosswise of the opposite cnds'of-thc' coils, and pipesconnecting each manifold into each coil.

LOUIS N. UDELL.

